The study did not identify specific standards for the field of transport. However, some materials, such as, e.g., silicone rubber and nano-calcium carbonate as sealant have been widely used in automotive industry. The following three standards by ISO (1) and CEN (2) address these materials:

• ISO (2018). ISO 18473-3. Functional pigments and extenders for special application — Part 3: Fumed silica for silicone rubber application. Available at: https://www.iso.org/standard/69454.html 

• CEN (2019). EN ISO 18473-3. Functional pigments and extenders for special application — Part 3: Fumed silica for silicone rubber application (ISO 18473-3:2018). Available at: https://standards.cencenelec.eu/dyn/www/f?p=205:110:0::::FSP_PROJECT:68395&cs=1FF3294FC3D757BA9273FDD325BF4F0B9

• CEN (2018). EN ISO 18473-1. Functional pigments and extenders for special applications — Part 1: Nanoscale calcium carbonate for sealant application (ISO 18473-1:2015). Available at: https://standards.cencenelec.eu/dyn/www/f?p=205:110:0::::FSP_PROJECT:65761&cs=1A90AC8421D6209B59D0E91EC358B6CB5

Several ISO and CEN technical committees developed these standards:

• ISO/TC 256 – Pigments, dyestuffs and extenders.

• CEN/TC 298 – Pigments and extenders.